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High volume stability marine concrete and its preparation method

A technology for marine concrete and stability, applied in the field of marine concrete and its preparation, can solve the problems of concrete performance deterioration, shortening the service life of the structure, etc., and achieve the effects of improving compactness, reducing heat of hydration, and improving erosion ability.

Inactive Publication Date: 2007-02-14
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the concrete cracks due to poor concrete volume stability, various corrosive media in the marine environment can easily penetrate into the interior of the concrete, which will cause a sharp deterioration in the performance of the concrete and significantly shorten the service life of the structure

Method used

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  • High volume stability marine concrete and its preparation method

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Embodiment 1～5

[0039] Weigh the raw materials and mixing water according to the concrete mix ratio requirements in Table 1, pour them into the mixer and mix for 30-60 seconds until uniform. The strength grade of cement is 52.5, C 3 A content is less than 8%. The ground slag reaches the grade of S95 and above. The particle size of silica fume is 0.01~0.1μm, SiO 2 content greater than 90%. The maximum particle size of limestone or granite is less than 25mm. The length of the synthetic fiber is 4-6 mm, the diameter is less than 50 microns, the elongation is greater than 14%, and the tensile strength is greater than 300 MPa. The water reduction rate of the plasticizer is higher than 30%. The volume content of the aggregate in the marine concrete prepared in each embodiment is above 68%.

[0040] The main performance parameters of the marine concrete prepared in each embodiment are shown in Table 2.

[0041] Component

[0042] performance parameters

[0043] As can be ...

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Abstract

The present invention relates to marine engineering concrete and its preparation process. The marine engineering concrete with high volume stability consists of fine synthetic fiber in 0.05-0.15 vol%, cementing material in 400-500 kg / cu m, crushed stone in 1000-1300 kg / cu m, sand in 600-1000 kg / cu m, and plasiticizer accounting for 0.5-2.0 wt% of the cementing material. The cementing material includes Portland cement, ground ore slag and silica fume. The marine engineering concrete with high volume stability has high anticorrosion capacity to sulfate and chloride in sea water, low hydration heat, high microscopic compatibility, high strength, low cost, greatly raised volume stability and durability and raised resistance to environment temperature and humidity change.

Description

technical field [0001] The invention belongs to the field of marine concrete and its preparation method. Background technique [0002] The marine environment faced by marine concrete is relatively harsh. Seawater contains about 3.5% salt, mainly sodium ions, magnesium ions, chloride ions and sulfate ions. In addition to these soluble salts, the oxygen suspended on the surface of seawater or dissolved in seawater also promotes the chemical and electrochemical reactions inside the concrete, and has a severe corrosion effect on the steel bars in the concrete structure. Soluble carbon dioxide and hydrogen sulfide (mainly from decaying organic matter in the ocean) and other acidic substances in seawater will cause the neutralization of concrete, thereby destroying the passivation film of the steel reinforcement inside the concrete. The temperature difference between the upper and lower seawater not only generates temperature stress inside the concrete structure, but also promot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B16/06C04B14/04C04B24/26
Inventor 姚武钟文慧
Owner TONGJI UNIV
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